im looking to put the b16a1 motor in my 1990 integra LS. When I buy the engine do i have to buy the extras like altenator, pws pump, A/c compressor or can i just but the motor

ohh and is the difference between the two B16's 1 with 160 hp and the other w/ 170 hp only the ecu or is it something internally on the motor where does the extra 10 hp come from

thanx guys